SWAT Team Shows Up at Chicago Area High School Because Teacher Thought She Heard a Gunshot

After school--no sign of gunfire in the building

A police SWAT team responded to the north campus of Lyons Township High School in La Grange after an instructor reported — mistakenly — she had possibly heard gunfire.

Police from La Grange and nearby suburbs evacuated the high school as a precaution. But in the end, the response was a practice drill for authorities.